Start preparing tests to accept binary compiler input.

pkg/compiler/lib/src/use_unused_api.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// This file use methods that aren't used by dart2js.dart, but that we wish to
 /// keep anyway. This might be general API that isn't currently in use,
 /// debugging aids, or API only used for testing (see TODO below).
 
 library dart2js.use_unused_api;
 
@@ skipping 239 matching lines @@
   source_file_provider.SourceFileProvider sourceFileProvider = null;
   sourceFileProvider.getSourceFile(null);
   closedWorld.hasAnyUserDefinedGetter(null, null);
   closedWorld.subclassesOf(null);
   closedWorld.getClassHierarchyNode(null);
   closedWorld.getClassSet(null);
   closedWorld.haveAnyCommonSubtypes(null, null);
   typeGraphInferrer.getCallersOf(null);
   dart_types.Types.sorted(null);
   new dart_types.Types(null).copy(null);
-  sourceFileProvider.readStringFromUri(null);
 }
 
 useElements(
     [elements.ClassElement e,
     elements.Name n,
     modelx.FieldElementX f,
     PartialClassElement pce,
     PartialFunctionElement pfe,
     elements.LibraryElement l]) {
   e.lookupClassMember(null);
@@ skipping 24 matching lines @@
   operators.UnaryOperator.fromKind(null);
   operators.BinaryOperator.fromKind(null);
   new semantic_visitor.BulkSendVisitor()..apply(null, null);
   new semantic_visitor.TraversalVisitor(null).apply(null, null);
   new semantic_visitor.BulkDeclarationVisitor().apply(null, null);
 }
 
 useDeferred([deferred_load.DeferredLoadTask task]) {
   task.dump();
 }